Discordances in cosmology and the violation of slow-roll inflationary dynamics

Abstract

We identify examples of single field inflationary trajectories beyond the slow-roll regime which improve the fit to Planck 2018 data compared to baseline $\Lambda$CDM model with power law form of primordial spectrum and at the same time alleviate existing tensions between different data sets in the estimate of cosmological parameters such as $H_0$ and $S_8$. A damped oscillation in the first Hubble flow function - or equivalently a feature in the potential - and the corresponding localized oscillations in the primordial power spectrum partially mimic the improvement in the fit of Planck data due to $A_L$ or ${\Omega }_K$. Compared to the baseline model, this model can lead simultaneously to larger value of $H_0$ and a smaller value of $S_8$, a trend which can be enhanced when the most recent SH0ES measurement for $H_0$ is combined with Planck and BK18 data. Large scale structure data and more precise CMB polarization measurements will further provide critical tests of this intermediate fast roll phase.

8 pages, 4 figures and 1 table

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Cited by in corpus (17)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Inflationary interpretation of the stochastic gravitational wave background signal detected by pulsar timing array experiments
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• Effect of damped oscillations in the inflationary potential
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• Bayesian inference methodology for Primordial Power Spectrum reconstructions from Large Scale Structure
• Testing $\Lambda$CDM with eBOSS data using a model independent diagnostic
• Nonlinear Lattice Framework for Inflation: Bridging stochastic inflation and the $\delta N$ formalism